1. Which of the following conditions is taken into account in case of most economical circular channel section?
a) Minimum wetted perimeter
b) Minimum wetted area
c) Maximum velocity
d) Maximum depthView Answer

Answer: c
Explanation: In case of a circular channel the depth continuously varies, hence the wetted area and wetted perimeter changes. Therefore the condition of maximum velocity is taken under consideration.

5. Determine the depth of flow in case of maximum velocity when the radius of the channel is 2.2m.
a) 3.56m
b) 4.56m
c) 5.56m
d) 6.56mView Answer

Answer: a
Explanation: Depth = 0.81D = 0.81(4.4) = 3.56m.

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6. The maximum discharge through a most economical circular section in case of maximum velocity is 0.16 m3/s calculate the bed slope of the channel if the radius is 0.4m and C = 55.
a) 1 in 1000
b) 1 in 1100
c) 1 in 1200
d) 1 in 1300View Answer

Answer: c
Explanation:

7. The maximum discharge through a circular channel is 0.38 m3/s and the radius of the channel is 0.6m. Calculate the value of C if S0=1 in 1000.
a) 45
b) 50
c) 55
d) 60View Answer

Answer: b
Explanation:

8. The maximum discharge through a circular channel is 0.61 m3/s and the radius of the section is 0.7m. Calculate the value of n if the bed slope value is 1 in 1100.
a) 0.018
b) 0.019
c) 0.020
d) 0.021View Answer